Handle project having experiments with no data

[mattseddon]

Fixes:

When I'm trying to show experiments/plots, that "You project contains no data".
But I have some... experiments and those plots
Any ideas why is VSCode behave like this?  Also, no clear what should I do here

From https://iterativeai.slack.com/archives/CB41NAL8H/p1701257451702629

[julieg18]

This updates the experiments tree but the webview is still showing the "has no data" message:

I updated Experiments.getHasData(), fixing setup experiments, to see if the webviews could work without none default columns but no luck:

[mattseddon]

This updates the experiments tree but the webview is still showing the "has no data" message:

@julieg18 what data/setup are you using?

[julieg18]

@julieg18 what data/setup are you using?

Technically already answered synchronously, but I'm running the project posted by Mikhail in the Slack thread.

[julieg18]

Single plots project is working now, great work!

[codeclimate]

Code Climate has analyzed commit 215c4b7 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (85% is the threshold).

This pull request will bring the total coverage in the repository to 95.3% (0.0% change).

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